.conter {
  width: 600px;
  margin: auto;
  display: flex;
  flex-direction: column;
  border: 1px solid black;
}
.conter .formula {
  height: 60px;
  margin: 10px;
  border-radius: 5px;
  display: flex;
}
.conter .formula .mula {
  width: 100%;
  display: flex;
}
.conter .formula .mula input {
  width: 100%;
  height: 80%;
  margin: 3px;
  text-align: center;
  outline: none;
  font-size: 24px;
}
.conter .formula .mula select {
  border: 0;
  outline: none;
  width: 150px;
  font-size: 24px;
}
.conter .formula .mula select option {
  font-size: 16px;
}
.conter .formula div:nth-child(2) {
  width: 20%;
  text-align: center;
  line-height: 60px;
}
.conter .formula .result {
  width: 20%;
  text-align: center;
  line-height: 60px;
  font-size: 24px;
  border: 1px solid black;
  margin: 3px 10px;
  box-sizing: border-box;
  overflow: hidden;
  outline: none;
}
.conter .process {
  width: 100%;
  height: 300px;
  border-radius: 5px;
  padding-top: 50px;
}
.conter .process .con {
  width: 120px;
  height: 90px;
  margin: auto;
}
.conter .process .con .addsub {
  width: 100%;
  height: 100%;
}
.conter .process .con .addsub > div {
  width: 100%;
  height: 50px;
  display: flex;
}
.conter .process .con .addsub > div > div {
  flex: 1;
  text-align: center;
  line-height: 50px;
  position: relative;
}
.conter .process .con .addsub > div > div .f1-bor,
.conter .process .con .addsub > div > div .f2-carryh,
.conter .process .con .addsub > div > div .f2-carryd {
  width: 20px !important;
  height: 30px;
  position: absolute;
}
.conter .process .con .addsub .f1 .f1-decade div {
  width: 30px;
}
.conter .process .con .addsub .f1 .f1-decade .f1-bor {
  top: -28px;
  left: 20%;
  font-size: 40px;
  color: darkorange;
}
.conter .process .con .addsub .f2 .f2-decade div {
  width: 30px;
}
.conter .process .con .addsub .f2 .f2-hundreds .f2-carryh,
.conter .process .con .addsub .f2 .f2-decade .f2-carryd {
  bottom: 0;
  right: 0;
  font-size: 12px;
  color: darkorange;
}
.conter .process .con .addsub .f4 > div .f4-carryk,
.conter .process .con .addsub .f4 > div .f4-carryh {
  width: 20px;
  height: 30px;
  position: absolute;
  bottom: 0;
  right: 0;
  font-size: 12px;
  color: darkorange;
}
.conter .process .con .addsub .f4 > div .f4-carryh-z {
  width: 20px;
  height: 30px;
  position: absolute;
  top: -20px;
  right: 0;
  font-size: 12px;
  color: darkorange;
}
.conter .process .con .addsub .f5,
.conter .process .con .addsub .f3 {
  border-top: 1px solid black;
}
